| Author |
Fuse ratings question
|
|
| davidw@sirwynn.plus.com 2006-08-29, 9:25 am |
| I have been having difficulty obtaining a glass fuse 5mmx20mm for a US
DVD player I own. It is rated at 2amps and 125volts. I can only seem to
find this particular size of fuse in 2amp 250volt. Can I use this
safely? Why is ther a voltage rating as well as amperes? Thanks in
advance for any help.
| |
| Rheilly Phoull 2006-08-29, 9:25 am |
| davidw@sirwynn.plus.com wrote:
> I have been having difficulty obtaining a glass fuse 5mmx20mm for a US
> DVD player I own. It is rated at 2amps and 125volts. I can only seem
> to find this particular size of fuse in 2amp 250volt. Can I use this
> safely? Why is ther a voltage rating as well as amperes? Thanks in
> advance for any help.
Use it and prosper !!
The voltage rating is the max voltage the fuse can interupt without damage
to the enclosure. The 250 is above the 125v.
--
Cheers ............. Rheilly P
| |
|
| davidw@sirwynn.plus.com wrote:
> I have been having difficulty obtaining a glass fuse 5mmx20mm for a US
> DVD player I own. It is rated at 2amps and 125volts. I can only seem to
> find this particular size of fuse in 2amp 250volt. Can I use this
> safely? Why is ther a voltage rating as well as amperes? Thanks in
> advance for any help.
>
When a fuse blows, it is possible for an arc to form
that will keep the current on, even though the fuse
has opened. This depends on the voltage rating of the
fuse and the applied voltage - the higher the applied
voltage, the greater the potential to arc across the
open fuse element. SO for higher applied voltages,
you need a higher voltage rated fuse.
Use that 250 V fuse. A 250 volt rated fuse can break a
250 volt circuit - or any voltage below that - and
extinguish the arc. It will work fine in a 125 volt
circuit.
Ed
|
|
|
|